def log( message )
  log_file  = File.join(SKETCHUP_PATH, 'Plugins', 'multisketchup', 'log.txt')
  perms     = File::APPEND | File::CREAT | File::WRONLY
  date_time = Time.now.strftime('%Y-%m-%d %I:%M:%S')
  str       = "[#{date_time}] (#{self.class.name}) #{message}"
  str = message 
  File.open( log_file, perms ) do |f|
    f.puts(str);
  end
  
  puts str
end
